Do you have a problem with a hard warm start as well?
You can "search" hard cold start. And hard warm start. Take a day to do this and have lunch ready. The info is awesome.
I did with my 84 SEC and decided to replace cold start valve. All injectors with new seats and seals. The vacuum pipes that border each valve cover and dip under the fuel distributor. New fuel filter,pump and accumulator.
New coil,wires,nonresistor sparkplugs. And a new O2 sensor.
I recently removed the idle control valve and cleaned it out with carb cleaner. Starts right up cold or hot and runs smooth as glass now.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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